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Mobile communication terminal device

a mobile communication and terminal technology, applied in the direction of digital transmission, transmission noise reduction, substation equipment, etc., can solve the problem of greater and achieve the effect of preventing deterioration of modulation accuracy

Inactive Publication Date: 2001-08-28
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

In order to solve the above problems, it is an object of the present invention to prevent deterioration of modulation accuracy due to a drop in a battery voltage which occurs when a circuit having a large power consumption, such as a transmission power amplifier, is driven.

Problems solved by technology

Specifically, as the remaining capacity of the battery 17 decreases, the degree of a phase error included in a carrier wave increases, resulting in greater deterioration of modulation accuracy.
Accordingly, when the remaining battery capacity has become lower than a predetermined value, it is necessary to replace the battery 17 considering maintenance of communication quality, which is a problem from the viewpoint of efficient use of the battery 17.

Method used

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first embodiment

FIG. 1 is a block diagram showing a mobile communication terminal device according to a first embodiment of the present invention. Referring to FIG. 1, reference numeral 1 denotes a voltage detector for detecting the output voltage of a voltage regulator 18; 2 denotes a correction phase storage section for storing pieces of correction phase information each having a characteristic opposite to that of a phase error included in a carrier wave, the phase error being produced due to a voltage drop; and 3 denotes a correction phase outputting section for selectively outputting to a phase adder 12 correction phase information according to a battery voltage detected by the voltage detector 1 when a voltage drop occurs. It should be noted that since components in FIG. 1 which are the same as or correspond to those in FIG. 16 are denoted by like numerals, the explanation of those components will be omitted.

FIG. 2 is a block diagram showing a correction phase outputting section of a mobile co...

second embodiment

FIG. 7 is a block diagram showing a correction phase outputting section of a mobile communication terminal device according to a second embodiment of the present invention. Reference numeral 4 denotes a battery type identifying section for identifying a battery type to output battery type information. It should be noted that since components in FIG. 7 which are the same as or correspond to those shown in FIG. 1 are denoted by like numerals, the explanation of those components will be omitted. FIG. 8 is a diagram showing a table which stores correction phase information corresponding to both battery voltages at the time of voltage drops and battery types. This table is stored in a correction phase storage section 2. FIG. 9 is a block diagram showing the internal circuit of a nicad battery. FIG. 10 is a block diagram showing the internal circuit of a lithium ion battery.

The mobile communication terminal device according to the first embodiment selects correction phase information base...

third embodiment

FIG. 11 is a block diagram showing a correction phase outputting section of a mobile communication terminal device according to a third embodiment of the present invention. Reference numeral 9 denotes a control section for outputting the transmission power control level of a transmission power amplifier 19 to a correction phase outputting section 3. It should be noted that since components in FIG. 11 which are the same as or correspond to those shown in FIG. 1 are denoted by like numerals, the explanation of those components will be omitted. FIG. 12 is a diagram showing a table which stores correction phase information corresponding to both battery voltages at the time of voltage drops and transmission power control levels. This table is stored in a correction phase storage section 2.

The mobile communication terminal device according to the first embodiment selects correction phase information based on a battery voltage at the time of a voltage drop. However, a battery voltage drop ...

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Abstract

A mobile communication terminal device of the present invention includes: a voltage detector for detecting a battery voltage at the time of a voltage drop; a correction phase storage section for storing pieces of correction phase information each having a characteristic opposite to that of a phase error in a carrier wave produced due to a drop in the battery voltage; a correction phase outputting section for selecting correction phase information based on the battery voltage at the time of the voltage drop and outputting the selected correction phase information to a baseband modulator to change phase information in a baseband signal; and a modulator for modulating a carrier wave according to the baseband signal output from the correction phase outputting section so as to cancel the phase error included in the carrier wave.

Description

BACKGROUND OF THE INVENTION1. Field of the InventionThe present invention relates to a battery-powered mobile communication terminal device.2. Description of the Related ArtIn recent mobile communication terminal devices such as cellular phones, battery voltages employed have been lowered as the operational voltages of the internal circuits have been decreased. On the other hand, lithium ion batteries have become widely used because they have an advantage in battery capacity and weight. FIG. 16 is a block diagram showing the configuration of a transmitting section of a conventional mobile communication terminal device; FIG. 17 is an explanatory diagram illustrating a relationship between an input signal and its modulation frequencies; FIG. 18 is an explanatory diagram illustrating the output phase of a baseband signal output from a baseband modulator; FIG. 19 is an explanatory diagram illustrating phase errors included in a carrier wave; FIG. 20 is an explanatory diagram illustratin...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04B15/00H04B1/16H04L27/34H04B1/04H04L27/36H04B1/54H04B1/56H04B1/3822H04B1/40
CPCH04B1/04H04B1/0475H04B1/1607H04B1/56H04B15/005H04B2215/063H04L27/368
Inventor HIGUCHI, KOJI
Owner MITSUBISHI ELECTRIC CORP
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